If xy≠0, and x-y= x- y, which of the following must be true? i) xy=1 ii) x>0 iii) x^2-2xy+y^2=0

If xy≠0, and x-y= x- y, which of the following must be tr...

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PS · Problem Solving

705-805

Roots

xy≠0

, and

\sqrt{x-y}=\sqrt{x}-\sqrt{y}

, which of the following must be true? i)

\frac{x}{y}=1

ii)

x>0

iii)

x^2-2xy+y^2=0

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Difficulty

705-805

Type